Thumb-nut wrench



(No Model.)

G. W. KIMBALL.

THUMB NUT WRENCH. No. 397,988. Patented Feb. 19, 1889.

all)" r Waslliugim 92 C- UNITED STATES PATEN OFFICE.

CHARLES IV. KIMBALL, (IF CHICAGO, ILLINOIS.

THUMB-NUT WRENCH.

SPECIFICATION forming part of Letters Patent No. 397,988, dated February19, 1889.

I Application filed June 5, 1888. Serial No. 276,134; (No model.)

. of which the followingis a full, clear, and exact description, thatwill enable others to make and use the same, reference being had to theaccompanying d ra w ings, f orm in g a part of th is specification.

The object of this invention is to provide a false thumb-nut which maybe placed perma nently upon any ordinary threaded bolt and accompanyingnut, and used as a wrench in manipulating the threaded nut.

Figure 1 is an elevation of a screw-threaded bolt and nut embodying myimproved feature; Fig. 2, a horizontal section of the same in the plane2, Fig. 1; and Fig. 3, a perspective of the same.

Referring to the drawings, A represents an ordinary screw-threaded bolt,B the usual nut having a threaded engagement with the same, and O afalse or blank thumb-nut.

The false thumb-nut is of the ordinary design, consisting of the wings aa and the central body or blank-nut, a. In this case the thumb-nut isnot threaded, but is provided with the usual perforation, b, and looselyengages with the bolt, as shown in Fig. 3.

The body of the thumb-nut is provided with the rectangular aperture (1,opening in from the two sides at right angles to the wings aa, so thatthe threaded nut may be loosely and removably inserted from either side.This construction permits of a number of differentsized nuts being usedwith the same wrenchnut, as they need not fit closely, and the nut andthumb nut are easily separated when not required to be used together.

In operation the threaded nut is first inserted in the body of thethumb-nut and then both are placed upon the bolt, the thumb-nut servingas a wrench to tighten. or loosen the threaded nut. This arrangement isespecially useful and convenient on carriage-bolts and bolts ofdifferent kinds. It dispenses wit-11 the use of a wrench and causes alarge saving in the manufacture, as the false thumb-nut and the real nutdo not cost as much as a threaded thumb-nut would alone.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, 1s

1. A false or blank thumb-nut provided with a rectangular apertureopening in from the two sides at right angles to the wings for the looseinsertion therein of a screw-threaded nutfrom either side, substantiallyas set forth.

2. A false or blank thumb-nut consisting of the wings a a and the bodya, said body being provided with an aperture extending through from sideto side and adapted to loosely retain a screw-threaded nut therein,substantially as and for the purpose set forth.

3. A false or blank thumb-nut provided with a rectangular openingextending through from side to side, in combination with a screwthreadednut, whereby the threaded nut may be loosely inserted and removablyretained in said thumb-nut, substantially as and for the purpose setforth.

CHARLES W. KIMBALL IVitnesses:

L. M. FREEMAN, L. B. OoUPLAND.

